Sheet material



FIG. 1 is a front elevational view of a first embodiment of a sheet material showing my new design; and,

FIG. 2 is a front elevational view of a second embodiment of a sheet material showing my new design.

The broken lines define boundaries of, but are not included in, the claimed design. Accordingly, the broken lines form no part of the claimed design. 

The ornamental design for a sheet material, as shown and described. 